Some people use a futon in the bedroom laying on tatami and then they put it away during the day. Others have a couch that converts to a bed. But I have found the ultimate solution today! Seems pretty cool and very uncomfortable which is the Japanese way (futon = not comfortable, small cards = not comfortable for tall people, etc) Check this out.
It’s a 2+1 [Chairs + Table]

The young singles ratio is getting increase in the society. These people live alone in small apartment in the city. They would like to have multipurpose furniture for using small room efficiently. There are two chairs and on table. Ordinary these are two chairs and table. But When they watch TV. It can be Sofa. And when they go to sleep. It is going to be a single bed.

I’ve seen things like this before but not quite as multipurpose.
The only problem I see is in the 2 chairs and a table stage you are eating on top of your sofa and bed! What if something is spilt?